Duplex vacuum floor cleaning tool



April 30, 1968 w. P. RIT ZAU ET AL 3,380,107

DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 I 5 Sheets-Sheet 1INVYENTORS RONALD DANKS WILLIAM F. RITZAU THEIR ATTORNEYS April 30, 1968w. P. RITZAU ET AL. 3,380,107

DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 3 Sheets-Sheet 2 OI HIM! 65 I m v i 70 44 20 /lo 48 52 as I 20 L 4 74 I2 ===gwi s llO 1.

- 22 78 Z2 .3 24 MINI I! I I 42 FIG. 5 V 52 66 Q -62 h. H2 INVENTORS, Ll2. m p ws TH EIR ATTORNEYS April 30, 1968 w, p, z u ET AL 3,380,107

DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 3 Sheets-Sheet 3INVENTORS RONALD DANKS WILLIAM P. RITZAU THUR ATTORNEYS United StatesPatent 3,380,107 DUPLEX VACUUM FL 0R CLEANING TOOL William P. Ritzau,Darien, Conn., and Ronald Danks, Santa Clara, Calif., assignors toElectrolux Corporation, Old Greenwich, Conn., a corporation of DelawareFiled Aug. 29, 1966, Ser. No. 575,788 8 Claims. (Cl. -417) Thisinvention relates to a duplex floor cleaner tool for a vacuum cleanerhaving a nozzle body provided with a pair of opposed cleaning sides usedrespectively, for cleaning soft'surfaces such as rugs and hard surfacessuch as wood floors, the cleaning sides being brought to cleaningposition alternately by rotating the nozzle body about its associatedelbow. The invention is more particularly concerned with providing meansfor automatically selectively positioning a control valve within thenozzle body to close off the air inlet at the side of the nozzle bodywhich is not being used, upon rotation of the nozzle body about the toolelbow.

Multi-purpose vacuum floor cleaner tools having two cleaning sideseither of which may be manipulated to a cleaning position by rotatingthe nozzle body of the tool about the tool elbow and wand with which itis connected are known in the art. The known duplex floor cleaner toolis provided with one cleaning side having a brush element for cleaninghard wood floors, linoleum covered surfaces, etc., whereas the othercleaning side has a smooth cleaning surface adapting it for usefor'cleaning rugs, carpets, and like soft surfaces, with the respectivecleaning sides being brought to cleaning position alternately byrotating the tool nozzle body 180 relative to the tool elbow. The duplexcharacter of this vacuum cleaner tool requires that it be provided withvalve means in the tool body which isolates the side of the tool that isnot being used from the suction air supply in order to maintain maximumsuction at the side of the tool on the floor or rug. Such valve meansmay take various forms, as for example it can be a snap-action leafspring valve member or it may be a rotary valve member, in either casethe valve means is selectively positioned between one of two closurepositions to block the air passage leading to the side of the tool whichis not in cleaning position.

The vacuum cleaner tool of the present invention is characterized by thefeature that the proper selective positioning of the valve means thereinis controlled by the manipulation of the cleaning tool bodyautomatically upon the rotation of same about the suction tube or elbowwith which it is connected. Thus, for example, if the brush side of thetool (hard surface cleaning) is in cleaning position and it becomesnecessary to use the tool on a rug, the user picks up the cleaner tooland rotates it about the associated elbow to shift or interchange thecleaning side position. As the tool body rotates, means therein whichare in engagement with the valve means become operable to shiftautomatically the positioning of the valve means out of its positionclosing the air suction passage leading to the rug cleaning side into aposition opening the rug cleaning air passage and closing off the airsuction passage leading to the floor cleaning side as the latter ismoved to a non-leaning position. The valve positioning means in one formcomprises a camming projection or stud fixed to the elbow of the tooland which upon relative rotation between the nozzle body and elbowengages with an actuating lever carried in the tool body and which isconnected to the valve means. Engagement of the camming projection withthe actuating lever is effective to move the actuating lever between twopositions corresponding to the closure positions of the valve means.Thus, the aforementioned relative rotation between the nozzle body andassociated elbow is effective to cause a shift of the position of thevalve means to close the elbow associated with the side of the cleanertool moved to a non-cleaning position. The valve actuating mechanism canbe designed so that it is not effective to shift the valve positionuntil the nozzle body is rotated about the elbow in excess of apredetermined magnitude, i.e., at least In this manner, a suitable rangeof relative rotation between the elbow and nozzle body in clockwise andcounterclockwise directions is possible Without affecting the valveposition when maneuvering the tool body beneath low objects such assofas, cabinets, and the like.

According to the invention, the valve actuating lever is supported inthe tool body for pivoting movement between the two positions thereofcorresponding to the two valve closure positions and is coupled at oneend with the valve means. A significant feature of the invention is thatthe positive opera-tion of the valve actuating lever is provided by aresilient portion whereby said resilient portion is deflectedsufficiently to allow the camming projection to ride clear of theactuating mechanism subsequent to the positive shifting of the valvemeans to a selected closure position.

Further objects and advantages will become apparent from a considerationof representative embodiments of the principles of the invention to bedescribed. The invention accordingly comprises the features ofconstruction, combination of elements, and arrangement of parts, whichwill be exemplified in the construction hereinafter set forth and thescope of the invention will be indicated in the claims.

Reference should be had to the following detailed description taken inconjunction with the accompanying drawings in which:

FIGURE 1 is a plan view of a duplex vacuum cleaner tool constructedaccording to the principles of the present invention, parts of the toolbody being broken away to illustrate constructional features thereof.

FIGURE 2 is a sectional view as taken along the line 22 in FIGURE 1.

FIGURE 3 is a sectional view as taken along the line 33 in FIGURE 1.

FIGURE 4 is a sectional view as taken along the line 44 in FIGURE 1, therug-cleaning side of the vacuum cleaner tool being shown in cleaningposition.

FIGURE 5 is a sectional view as taken along the line 55 in FIGURE 1.

FIGURE 6 is a perspective view of the valve actuating mechanism employedin the floor cleaner tool illustrated in FIGURES 1-5.

FIGURE 7 is a perspective view similar to FIGURE 6 illustrating asomewhat different form of valve actuating mechanism.

FIGURE 8 is a perspective view similar to FIGURES 6 and 7 illustratingstill another form of valve actuating mechanism.

FIGURE 9 is a view taken generally along the line 99 in FIGURE 8 showingthe condition of the resilient end of the actuating lever at firstengagement of the camming projection therewith.

FIGURE 10 is the same as FIGURE 9 except it shows the manner in whichthe resilient end of the actuating lever yields to allow the cammingprojection to ride clear of the lever subsequent to shifting of thevalve closure position.

Throughout the description like reference numerals are used to denotelike parts in the drawings.

The valve positioning means of the present invention is described by wayof example herein as being used in conjunction with a duplex vacuumcleaner tool having a snap action leaf spring type valve element whereinthe valve element is selectively positionable between one or the otherof two oppositely biased positions closing off, respectively, thesuction passages leading to the floor cleaning side and the rug cleaningside of the cleaner tool. However, it should occur to those skilled inthe art that the valve positioning means is suited for use with othertypes of duplex vacuum cleaner tool valve members as for example, arotary valve of the type described in US. Patent No. 3,012,268.

Referring now to the floor cleaner tool construction shown in thedrawings, which illustrate a duplex type having an elongated nozzle bodycomprised of interfitting upper and lower body members 12 and 14respectively, connected together by suitable fastening means such as thecountersunk screws 16 (FIG. 3). The structural arrangement of the upperand lower body members 12, 14 can be varied to facilitate manufactureand assembly but in general should be such when connected together toprovide the nozzle body 10 with a pair of opposed elongated cleaningsides. Thus one side of the nozzle body 10 constitutes a fioor cleaningside used for cleaning wood floors, tile covered surfaces and the like,and to that end is provided with brush elements 18 extendinglongitudinally of the tool body and secured thereto in channels 20formed in the upper body member 12 as best seen in FIGURE 4. The othercleaning side of the nozzle body 10 is used for cleaning rugs, carpetsand similar soft surfaces and for that reason is provided with aprotruding shoulder member 22 extending about the margin of the lowerbody member 14 with the shoulder being flattened along the rugcontacting surface as at 24. The shoulder member can be formed integralwith the lower body member or as in the embodiment illustrated by aseparately formed element secured to the body member in known manner.

Each cleaning side of the nozzle body has an air suction opening whichfunctions in the usual manner. Thus the floor cleaning side has anelongated laterally extending depression or recess 26 which as bestshown in FIG- URE 1 communicates by means of a nozzle aperture 28 formedin the upper body member 12 with a central cavity 30 in the tool body,the latter being defined by complemental recesses formed in therespective body members. Similarly, the lower body member 14 is providedwith a nozzle recess 32 which likewise extends longitudinally thereofand communicates with the central cavity 30 by means of a nozzleaperture 34 formed in the lower body member as shown. The suctionpassage 34 may have a somewhat greater width than the suction passage 28in the upper body member. The nozzle apertures 28, 34 serve to connectthe respective suction nozzle recesses 26, 32 with a source of suctionair depending upon the position of the valve member in the tool body ina manner to be described.

The nozzle body 10 is provided with a rearwardly directed portion 42which has a large opening for receiving elbow 44. A wand member 46, orother conduit-handle means, is connected to elbow 44 to establishcommunication between the nozzle body 10 and a tank type vacuum cleaner(not shown). The upper end of the elbow 44 may be provided with a collar48 in which is housed a wand locking ring 50, the latter being of knownconstruction and serving to securely connect the elbow to the wand. Thehorizontal branch 52 of the elbow 44 extends through rear housing coverplate 54 and is housed within the tool body as shown, the horizontalbranch extending into the nozzle body a distance sufiicient tocommunicate with central cavity 30. The connection of the nozzle body 10with elbow 44 is such that the nozzle body is rotatably on the elbow ina plane perpendicular to the axis of horizontal branch 52.

The valve member 40 is described herein by way of example as being aflat thin plate of spring metal normally maintained in a arcuatelybiased condition, and which is adapted to operate between two selectedclosure pOsitions within central cavity 30. The leaf spring or valvemember 40 is supported at its ends in anchorages 31 formed at each sideof the central cavity by suitable sur- 4 faces shaped in the structureof the upper and lower body members in regions where the said bodymembers abut. Thus, when the rug cleaning side of the floor cleaner toolis in cleaning position, the valve member 40 is positioned in anupwardly arcuately biased conditon at the upper side of the centralcavity as shown in full lines in FIGURE 3, and the central portionthereof closes off air passages 28, whereas when the nozzle body isrotated 180 around the elbow 44, the valve member 40 is shifted to anoppositely arcuately biased condition at the other side of the centralcavity, as shown in long and short dashed lines, in which closureposition it closes off the air passage 34 leading to the rug cleaningside which has been moved to a non-cleaning position by the rotationalmanipulation.

The movement of the valve member 40 between the two closure positionsshown in FIGURE 3 is achieved by distorting the spring plate formingvalve 40 in a direction opposite to its biased condition. One manner ofdistorting the spring valve 40 is to apply a force thereto at one ormore locations intermediate the ends thereof, thereby deforming it forexample from the solid line closure position of FIGURE 3 into aserpentine configuration, as indicated by line 40a FIG. 3, and through apoint of no return position causing it to snap over intO an oppositelybiased condition, as for example, the closure position shown in long andshort dashed lines of FIG. 3. The distorting force is applied to thespring valve 40 by the movement of an actuating lever assembly 62 (seeFIG. 6), which is located in the nozzle body 10 at one side of the elbow44 as shown in FIGURE 1. The actuating lever assembly 62 is comprised ofa main lever 110 the front end of which is coupled to the spring valve40 a distance from one end thereof. An auxiliary lever member 112comprises the rear section of the actuating lever assembly and extendsclosely adjacent the suction tube as shown. Both the main lever member110 and the auxiliary lever member 112 are supported on a suitable pivot66 carried within the nozzle body neck portion 42, the latter having avertical clearance passage as at 70 (FIG. 3) in which the actuatinglever members move when pivoted. The pivoting movement of the actuatinglever assembly is in a plane parallel to a vertical plane passingthrough the axis about which the tool body is rotatable. The main levermember is bent so that the front end, coupled to the valve spring, islaterally displaced relatively to the rear part 114, and the front endis shaped in the form of a fork, with the tines 74 of the fork embracingthe leaf spring as shown. As shown in FIGS. 1 and 6, both the main lever110 and auxiliary lever member 112 are preferably comprised of flatspring steel stock with the main lever 110 being mounted on pivot 66 insuch a manner that its major surface extends perpendicular to the axisof the pivot thus providing main lever 110 with a relatively highsection modulus to resist bending. On the other hand, auxiliary lever112 is mounted to have its major surface extend parallel to the pivotaxis and in consequence possesses a low section modulus making it fairlysusceptible to bending in a manner to be described. The rear part 114 ofmain lever member 110 is slotted as at 116 and serves to receive a tab118 integral with the auxiliary lever member 112. The slot 116-tab 118arrangement provides a connection means effective to insure unitarypivoting movement of the levers 110, 112 of the actuating lever assembly62 when shifting the valve member 40 between its operative positions. Asshown in FIGURE 4, the front end of the actuating lever 110 normallyextends upwardly as the spring valve 40 is biased in an upward directionin a clossure position across the aperture 28 leading to the floorcleaning side and thereby preventing communication of said aperture withcentral cavity 30. Thus air drawn into the nozzle body 10 enters by wayof the nozzle opening 32 associated with the rug cleaning side and viaelbow 44 and wand 46 draws into the vacuum cleaner (not shown), dirt,dust and other objects on the rug surface being cleaned. On the otherhand, when the nozzle body is rotated onehalf revolution to place theother cleaning side on a floor, an opposite biasing force is applied tothe spring valve by the actuating lever 110 deforming the spring valve40 into a serpentine configuration and snapping it through a dead-centerpoint causing it to arcuately bow in an opposite sense from the closureposition shown in solid lines in FIGURE 3 to the closure position shownin long and short dashed lines of this figure. In the latter position,the spring valve 40 seats against the seating surfaces 76 at the bottomof the nozzle body 10 closing oif the suction passage 34 leading to therug cleaning side and automatically placing the floor cleaning side incommunication with the central cavity 30. Similar seating surfaces alsoare provided at the top of the tool body adjacent suction passage 28.

The mode of operating the actuating lever assembly 62 to shift theposition of the valve member within the tool body will now be described.As shown in FIGURES 2 and 4 to 6, the elbow 44 is provided at the bottomthereof with a camming projection 78 which can be either formedintegrally with the elbow 44 or be made as part of a separate ringmember fixed on the elbow. The camming projection 78 is adapted toengage with the auxiliary lever member 112 when the nozzle body isrotated, to thereby pivot the entire actuating lever assembly 62 fromone to the other of its operating positions. In rotating the nozzle body10 to alternate the positioning of the cleaning sides, the nozzle bodyis rotated about the elbow 44 which remains fixed although in fact theelbow is free to rotate at least 90 relative to the tool body such aswhen manipulating the nozzle body under low objects including sofas,beds, etc. by turning the wand 46 to one side or the other in thecustomary manner without changing the valve member position.

For proper operation of the valve actuating assembly 62 when changingthe nozzle body 10 from a rug cleaning position to a floor cleaningposition, the nozzle body 10 must be rotated clockwise when viewed inFIGURE 3, and counterclockwise when changing over from a floor cleaningto a rug cleaning position. To insure that these proper rotationaldirections are followed, the tool body is provided with a weight 84(FIG. 3) which initiates rotation in the right direction. When thenozzle body 10 is rotated by the weight 84, it turns one-half arevolution or about 90 from whatever cleaning position the nozzle bodywas in. The valve member position is not changed, however, until thetool body is rotated relative to the suction tube through an angle inexcess of about 90. At about 90 of relative rotation, however, one fiatside 125 of the camming projection 78 engages with one face of auxiliarylever member 112 so that a small additional relative rotation beyond 90will pivot the actuating lever assembly, for example, from the positionshown in solid lines in FIGURE 4 to the position shown in dashed lineswith a corresponding shift of the valve member to a closure positionthen closing oif the suction passage 34 leading to the rug cleaningside. The spring steel lever member 112 and the effective lever lengththereof are selected such that contact between the auxiliary levermember 112 with the camming projection 78 does not result in any flexureor bending of the auxiliary lever member. On the contrary, the auxiliarylever member maintains sufiicient rigidity to move main lever member 110until the whole actuating lever assembly 62 pivots from one to the otherof its operating positions. However, after pivoting the lever assembly,it is necessary that the camming projection 78 be able to clear theauxiliary lever member 112 and move through 180 of relative rotationbetween the elbow and nozzle body to complete the interchange ofcleaning sides. This is accomplished by the resilient structure of theauxiliary lever member 112 which, as soon as the valve member closureposition has changed, and it is not possible for main lever member 110to continue to pivot (clockwise-FIGURE 4), auxiliary lever member 112starts to flex upwardly from the solid line position shown in FIGURE 6to that shown in dashed lines and ultimately rides free of the cammingprojection. Upon its disengagement from the camming projection,auxiliary lever member 112 springs back to a linear shape in position toonce again engage the camming projection when returning the rug cleaningside of the nozzle body to a cleaning position by rotating the nozzlebody counterclockwise.

FIGURE 7 shows a somewhat different form of construction wherein theactuating lever generally designated 162, instead of comprising a mainlever member and auxiliary lever member, consists of a single piece ofspring steel having a front part 163 which is shaped as described abovein connection with main lever member 110, whereas the rear part 164 istwisted relative to the front part. Actuating lever 162, however,functions in the same manner as the actuating lever assembly 62.

FIGURES 8 to 10 show still another form of actuating lever assembly 262wherein the assembly comprises a main lever member 263 which serves thesame purpose as the main lever member previously described. It alsoincludes an auxiliary lever member 265 which, in contrast with auxiliarylever member 112, extends in the same plane as the main lever memberwith which it is associated. Thus the auxiliary lever member 265comprises a flat strip which at the rear end thereof extends a distancebeyond the terminal end of main lever member 263. A torsion spring 270mounted on pivot 66 has a pair of arms 272, 273 the ends of which havelateral extensions engaging above and below both the main and auxiliarylever members as shown. The torsion spring 270 has sufficient strengthto resist any secondary pivoting of the auxiliary lever member 265 unitafter the entire actuating lever assembly has been shifted from one tothe other of its two operating positions. However, after the leverassembly 262 has completed its pivotal movement, the auxiliary levermember 262 pivots from the position shown in FIGURE 9 to the positionshown in FIGURE 10 to allow the camming projection 78 to ride clear ofthe lever assembly. As soon as the camming projection is clear thetorsion spring 270 will then return the auxiliary lever member to theposition shown in FIGURE 9.

Various other changes and different embodiments of the valve mechanismof the present invention can be made within the principles described andindicated in the foregoing, and it is intended that all matter set outtherein or shown in the accompanying drawings should be interpreted asillustrative and not in a limiting sense.

What is claimed is:

1. In a duplex vacuum floor cleaner tool which includes an elbow, anozzle body rotatably connected to said elbow and having a pair ofopposed cleaning sides which are brought to a cleaning positionalternately by rotating said body one-half revolution on said elbow,said body having a pair of apertures opening within said body forcommunicating each of said cleaning sides and a central cavity withinthe body, said central cavity communicating with said elbow, and a valvemember supported in said body and normally positioned therein in aposition closing off the one of said pair of apertures associated withthe said cleaning side which is in a non-cleaning position thereby toblock communication of the said one aperture with said central cavity;valve positioning means comprising a projection fixed to said elbow, anda valve actuating assembly supported in said body for movement betweentwo positions corresponding to the closure positions of said valvemember and having a part operatively coupled with said valve member,said valve actuating assembly having another part which is engaged bysaid projection when said body and suction tube are rotated relative toeach other a distance in excess of a predetermined magnitude therebymoving said valve actuating assembly from one to the other of its twopositions and shifting the position of said valve member to thecorresponding closure position, said other part of the valve actuatingassembly comprising a resilient element having resistance to fiexureduring movement of said valve actuating assembly between said twopositions, but which flexes under the force of continued relativerotation of said body and elbow beyond said predetermined magnitude fordisengaging said projection from said other part of the valve actuatingassembly.

2. The duplex vacuum floor cleaner tool set forth in claim 1 wherein thepredetermined magnitude in excess of which relative rotation betweensaid body and elbow is effective to shift the valve member position issubstantially 90.

3. The duplex vacuum floor cleaner tool set forth in claim 1 whereinsaid valve actuating assembly comprises lever means supported in saidbody for pivoting movement between said two positions, said lever meansbeing pivotal about a point intermediate its ends, one end of said levermeans having coupled with said valve member, the other end of said levermeans comprising a resilient portion engaged by said projection whensaid body and suction tube are rotated relative to each other.

4. The duplex vacuum floor cleaner tool set forth in claim 3 whereinsaid lever means comprises a first lever member pivoted in said bodyintermediate its ends, one end of said first lever member being coupledwith said valve member, and a second lever member pivoted at one end onthe same pivot axis as the first lever member, said second lever memberbeing connected to said first lever member and having a free endextending beyond the outer end of said first lever member, said free endbeing engageable with said projection and comprising a blade spring.

5. The duplex vacuum floor cleaner tool set forth in claim 4 whereinsaid first and second lever members are relatively fiat members, theplane of the body of the first lever member extending perpendicular tothe axis about which it pivots, the plane of the body of the secondlever member extending transverse to that of said first lever member.

6. The duplex vacuum floor cleaner tool set forth in claim 3 wherein theother end of said lever means comprises a rear part being bent relativeto the plane of the major surface of said one end; said lever meansconsisting of spring steel.

7. The duplex vacuum floor cleaner tool set forth in claim 3 whereinsaid lever means comprises a first lever member pivoted in said bodyintermediate its ends, one end of said first lever member being coupledwith said valve member, a second lever member pivoted at one end on thesame pivot axis as the first lever member and having a free endextending beyond the other end of said first lever member, said free endbeing engageable with said projection, and a torsion spring having apair of legs with lateral branches enclosing each of said lever membersat opposite edges thereof, said torsion spring having sufiicientstrength to provide for unitary movement of said lever members when saidvalve actuating assembly is pivoted between its two positions, saidtorsion spring having insufiicient strength to prevent secondarypivoting of said second lever member subsequent to movement of saidassembly and continued relative rotation of said elbow and body beyondsaid predetermined magnitude.

8. The duplex vacuum floor cleaner tool set forth in claim 1 whereinsaid valve member comprises a thin plate of spring steel connected insaid nozzle body at opposite ends for normally imparting an arcuateshape thereto, said valve actuating member moving said spring plate toits dead center position whereby said plate snaps into an oppositearcuate shape.

References Cited UNITED STATES PATENTS 2,500,977 3/1950 Beede 15-3732,838,783 6/1958 Allen 15-417 2,873,469 2/1959 Borkoski l54l7 3,048,8778/1962 Descarries l54l7 ROBERT W. MITCHELL, Primary Examiner.

1. IN A DUPLEX VACUUM FLOOR CLEANER TOOL WHICH INCLUDES AN ELBOW, ANOZZLE BODY ROTATABLY CONNECTED TO SAID ELBOW AND HAVING A PAIR OFOPPOSED CLEANING SIDES WHICH ARE BROUGHT TO A CLEANING POSITIONALTERNATELY BY ROTATING SAID BODY ONE-HALF REVOLUTION ON SAID ELBOW,SAID BODY HAVING A PAIR OF APERTURES OPENING WITHIN SAID BODY FORCOMMUNICATING EACH OF SAID CLEANING SIDES AND A CENTRAL CAVITY WITHINTHE BODY, SAID CENTRAL CAVITY COMMUNICATING WITH SAID ELBOW, AND A VALVEMEMBER SUPPORTED IN SAID BODY AND NORMALLY POSITIONED THEREIN IN APOSITION CLOSING OFF THE ONE OF SAID PAIR OF APERTURES ASSOCIATED WITHTHE SAID CLEANING SIDE WHICH IS IN A NON-CLEANING POSITION THEREBY TOBLOCK COMMUNICATION OF THE SAID ONE APERTURE WITH SAID CENTRAL CAVITY;VALVE POSITIONING MEANS COMPRISING A PROJECTION FIXED TO SAID ELBOW, ANDA VALVE ACTUATING ASSEMBLY SUPPORTED IN SAID BODY FOR MOVEMENT BETWEENTWO POSITIONS CORRESPONDING TO THE CLOSURE POSITIONS OF SAID VALVEMEMBER AND HAVING A PART OPERATIVELY COUPLED WITH SAID VALVE MEMBER,SAID VALVE ACTUATING ASSEMBLY HAVING ANOTHER PART WHICH IS ENGAGED BYSAID PROJECTION WHEN SAID BODY AND SUCTION TUBE ARE ROTATED RELATIVE TOEACH OTHER A DISTANCE IN EXCESS OF A PREDETERMINED MAGNITUDE THEREBYMOVING SAID VALVE ACTUATING ASSEMBLY FROM ONE TO THE OTHER OF ITS TWOPOSITIONS AND SHIFTING THE POSITION OF SAID VALVE MEMBER TO THECORRESPONDING CLOSURE POSITION, SAID OTHER PART OF THE VALVE ACTUATINGASSEMBLY COMPRISING A RESILIENT ELEMENT HAVING RESISTANCE TO FLEXUREDURING MOVEMENT OF SAID VALVE ACTUATING ASSEMBLY BETWEEN SAID TWOPOSITIONS, BUT WHICH FLEXES UNDER THE FORCE OF CONTINUED RELATIVEROTATION OF SAID BODY AND ELBOW BEYOND SAID PREDETERMINED MAGNITUDE FORDISENGAGING SAID PROJECTION FROM SAID OTHER PART OF THE VALVE ACTUATINGASSEMBLY.